<template>
  <div class="home-category" @mouseleave="currentId = null">
    <ul class="menu">
      <li v-for="item in menuList" :key="item.id" @mouseenter="currentId = item.id"
        :class="{ active: item.id === currentId }">
        <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
        <template v-if="item.children">
          <RouterLink :to="`/category/sub/${i.id}`" v-for="i in item.children" :key="i.id">{{ i.name }}</RouterLink>
        </template>
        <!-- 没有数据显示骨架 -->
        <template v-else>
          <skeleton width="60px" height="18px" style="margin-right: 5px" bg="rgba(255,255,255,0.2)"></skeleton>
          <skeleton width="50px" height="18px" bg="rgba(255,255,255,0.2)"></skeleton>
        </template>
      </li>
    </ul>
    <!-- 弹层 -->
    <div class="layer" v-if="categoryShow && categoryShow.children">
      <h4>
        {{ categoryShow && categoryShow.brands ? "品牌" : "分类" }}推荐
        <small>根据您的购买或浏览记录推荐</small>
      </h4>
      <!-- 商品 -->
      <ul>
        <li v-for="item in categoryShow.goods" :key="item.id">
          <RouterLink :to="`/product/${item.id}`">
            <img :src="item.picture" alt="" />
            <div class="info">
              <p class="name ellipsis-2">{{ item.name }}</p>
              <p class="desc ellipsis">{{ item.desc }}</p>
              <p class="price"><i>¥</i>{{ item.price }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
      <!-- 品牌 -->
      <ul v-if="categoryShow && categoryShow.brands">
        <li class="brand" v-for="item in categoryShow.brands" :key="item.id">
          <RouterLink to="/">
            <img :src="item.picture" alt="" />
            <div class="info">
              <p class="place">
                <i class="iconfont icon-dingwei"></i>{{ item.place }}
              </p>
              <p class="name ellipsis">{{ item.name }}</p>
              <p class="desc ellipsis-2">{{ item.desc }}</p>
            </div>
          </RouterLink>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
  import {
    computed,
    reactive,
    ref
  } from "vue-demi";
  import {
    findBrand
  } from "api/home.js";
  import {
    useStore
  } from "vuex";
  import Skeleton from "../../../components/common/Skeleton.vue";
  export default {
    components: {
      Skeleton
    },
    name: "HomeCategory",
    setup() {
      const store = useStore();
      const brand = reactive({
        id: "brand",
        name: "品牌",
        children: [{
          id: "brand-child",
          name: "品牌推荐"
        }],
        brands: [],
      });
      const menuList = computed(() => {
        const list = store.state.catagory.catagory.map((item) => {
          return {
            id: item.id,
            name: item.name,
            children: item.children && item.children.slice(0, 2),
            goods: item.goods,
          };
        });
        list.push(brand);
        return list;
      });

      //子目录数据显示
      const currentId = ref(null);
      const categoryShow = computed(() => {
        return menuList.value.find((item) => {
          return item.id === currentId.value;
        });
      });

      //方法的方式执行不了
      // let subList = ref(null);
      // const categoryShow = (id) => {
      //   subList = menuList.value.find((item) => item.id === id);
      // };
      // console.log(subList);
      // const log = () => {
      //   console.log(subList);
      // };
      // onUpdated(log);

      //获取品牌
      //setup尽量不用async await
      findBrand(6).then((res) => {
        brand.brands = res.result;
      });

      return {
        menuList,
        categoryShow,
        currentId
      };
      // return { menuList, categoryShow, subList };
    },
  };

</script>

<style lang="less" scoped>
  .home-category {
    width: 250px;
    height: 500px;
    background: rgba(0, 0, 0, 0.8);
    position: relative;
    z-index: 99;

    .xtx-skeleton {
      animation: fade 1s linear infinite alternate;
    }

    @keyframes fade {
      from {
        opacity: 0.2;
      }

      to {
        opacity: 1;
      }
    }

    .menu {
      li {
        padding-left: 40px;
        height: 50px;
        line-height: 50px;

        &:hover,
        &.active {
          background: @xtxColor;
        }

        a {
          margin-right: 4px;
          color: #fff;

          &:first-child {
            font-size: 16px;
          }
        }
      }
    }

    .layer {
      width: 990px;
      height: 500px;
      background: rgba(255, 255, 255, 0.8);
      position: absolute;
      left: 250px;
      top: 0;
      display: none;
      padding: 0 15px;

      h4 {
        font-size: 20px;
        font-weight: normal;
        line-height: 80px;

        small {
          font-size: 16px;
          color: #666;
        }
      }

      ul {
        display: flex;
        flex-wrap: wrap;

        li {
          width: 310px;
          height: 120px;
          margin-right: 15px;
          margin-bottom: 15px;
          border: 1px solid #eee;
          border-radius: 4px;
          background: #fff;

          &:nth-child(3n) {
            margin-right: 0;
          }

          a {
            display: flex;
            width: 100%;
            height: 100%;
            align-items: center;
            padding: 10px;

            &:hover {
              background: #e3f9f4;
            }

            img {
              width: 95px;
              height: 95px;
            }

            .info {
              padding-left: 10px;
              line-height: 24px;
              width: 190px;

              .name {
                font-size: 16px;
                color: #666;
              }

              .desc {
                color: #999;
              }

              .price {
                font-size: 22px;
                color: @priceColor;

                i {
                  font-size: 16px;
                }
              }
            }
          }
        }

        li.brand {
          height: 180px;

          a {
            align-items: flex-start;

            img {
              width: 120px;
              height: 160px;
            }

            .info {
              p {
                margin-top: 8px;
              }

              .place {
                color: #999;
              }
            }
          }
        }
      }
    }

    &:hover {
      .layer {
        display: block;
      }
    }
  }

</style>
